A few very simple pentatonic-based ideas that are great for beginners, and a nice review for more advanced players.
This intensive 30-minute guitar workout provides good technical practice which should definitely keep your chops in shape.
Being able to accurately play quintuplet licks and sequences will add dynamics to your playing and give you more interesting soloing options.
Testing the accuracy of your bends and vibrato is a good way to judge how developed you are as a guitarist and a musician.
Learn a double-picking technique Jake E. Lee used to great effect during his time with Ozzy Osbourne.
Wanna get better but are pressed for time? Here's a quick, intensive guitar "workout" that can be completed in 30 minutes.
If you've spent a period of time away from playing, these useful exercises will help rebuild your technique.